TFA9881_1104 PHILIPS [NXP Semiconductors], TFA9881_1104 Datasheet - Page 22

• Manufacturer Part Number: TFA9881_1104
• Description: 3.4 W PDM input class-D audio amplifier
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
TFA9881
Product data sheet
Fig 13. THD+N + power supply intermodulation distortion as a function of frequency
Fig 14. Normalized gain as a function of frequency
THD+N+IMD
(dB)
(%)
10
10
10
(1) V
(2) f
(3) f
(4) f
G
−0.5
−1.0
a. V
1.0
0.5
10
−1
−2
−3
1
0
10
10
V
V
ripple
ripple
ripple
ripple
DDP
DDP
ripple
= 217 Hz.
= 1 kHz.
= 6 kHz.
= 3.6 V, R
= 0 V (f
= 3.6 V, R
= 200 mV (RMS)
10
10
2
2
ripple
L
= 4 Ω, L
L
= 0 Hz).
= 4 Ω, L
10
10
3
3
L
= 20 μH, P
L
= 20 μH, P
10
10
4
4
All information provided in this document is subject to legal disclaimers.
001aam641
001aam643
f
f
o
i
i
(4)
(3)
(2)
(1)
(Hz)
(Hz)
= 500 mW.
o
10
= 100 mW
10
5
5
Rev. 2 — 1 April 2011
Fig 15. PSRR as a function of ripple frequency
THD+N+IMD
PSRR
(dB)
(%)
−110
10
10
10
(1) V
(2) f
(3) f
(4) f
(1) V
(2) V
b. V
−10
−30
−50
−70
−90
10
−1
−2
−3
1
10
10
V
R
ripple
ripple
ripple
ripple
DDP
DDP
DDP
ripple
L
= 4 Ω, L
3.4 W PDM input class-D audio amplifier
= 217 Hz.
= 1 kHz.
= 6 kHz.
= 3.6 V.
= 5 V.
= 0 V (f
= 5 V, R
= 200 mV (RMS)
10
10
L
2
(1)
(2)
2
= 20 μH, V
ripple
L
= 4 Ω, L
= 0 Hz).
10
10
3
3
ripple
L
= 20 μH, P
= 200 mV (RMS).
10
10
TFA9881
4
4
© NXP B.V. 2011. All rights reserved.
f
ripple
001aam642
001aam644
f
i
(4)
(3)
(2)
(1)
(Hz)
o
(Hz)
= 100 mW
10
10
5
5
22 of 32